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我が国の鋼橋上部構造の設計においては大地震に対する耐震設計を除き鋼材の弾性域のみを考慮した許容応力度設計法が採用されているため鋼材の塑性域での性能は有効に活用されていないしかし諸外国の設計基準には圧縮域における座屈現象が生じないような断面に対して断面の全塑性モーメントを基準とする設計法も規定されており塑性設計の概念を我が国に導入することは建設コスト削減の観点から有効だと考えられる著者らはこれまでに合成断面の正曲げ耐力に及ぼす鋼材特性の影響について解析的に検討してきた今回はこれまでの解析手法にモンテカルロシミュレーションを応用し確率変数と仮定した材料パラメータが曲げ耐力に及ぼす影響を調査するとともにその影響を考慮した正曲げ耐力の設計式を提案するJapanese design code for highway bridges has adopted the allowable stress design concept which requires the structures to have elastic behavior under the given design conditions. On the other hand some design codes in foreign countries include the plastic design concept, which can contribute to the cost reduction of steel bridges. In this study, considering strength and some other parameters in stress-strain relation of materials as random variables, Monte Carlo simulation is carried out in order to examine their influence on the probability distribution of positive flexural strength of composite compact sections, and the design formulae of positive flexural strength considering variation of material strength are proposed

DESIGN FORMULAE OF POSITIVE FLEXURAL STRENGTH OF COMPOSITE I-SECTIONS CONSIDERING VARIATION OF MATERIAL PROPERTIES